I have some wonderful Chromecast Audios, which can be grouped and streamed to simultaneously. To do this, I can open Plex on my phone or iPad, and choose the sources and away I go. I have all my music hosted on a NAS, which Plex pulls from.

The "problem" is I have to carry my device with me to skip tracks or stop playback, if I move to the lounge from the kitchen but leave my phone behind, there is no way of stopping playback without finding the original device.

What I'm after is an internal music server (like Runeaudio or Moodeaudio) running on a Raspberry Pi which is web accessible and can stream to a Chromecast. This means I can change the playlist or pause playback from any device with a browser.